A Patient Reports to the Nurse That Last Night She

A patient reports to the nurse that last night she had difficulty falling sleep after a social evening with friends,during which she consumed several alcoholic drinks.When unable to fall sleep after half an hour in bed,she brewed herself two cups of herbal tea containing valerian.In the morning,she awakened feeling very groggy and with a severe headache.The nurse should explain that:

A) valerian should be taken at least 1 hour after any alcohol to avoid side effects.
B) the "side effects" are really a hangover from her excessive alcohol use.
C) valerian may worsen the sedation from other central nervous system depressants.
D) herbal teas usually cause nervous system side effects such as headaches.